:root {
  --color-primario: #d2560d;
  --color-primario-oscuro: #a3430a;
  --color-oscuro: #1c1917;
  --color-acero: #6b6358;
  --color-fondo: #f1efec;
  --color-borde: #d9d3c8;
  --font-titulo: 'Oswald', system-ui, sans-serif;
  --font-cuerpo: 'Inter', system-ui, -apple-system, Segoe UI, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-cuerpo);
  background: var(--color-fondo);
  color: var(--color-oscuro);
  border-top: 5px solid;
  border-image: repeating-linear-gradient(-45deg, var(--color-oscuro) 0 14px, var(--color-primario) 14px 28px) 5;
}

a { color: inherit; }

h1, h2, h3, .logo, .main-nav a, nav.tabs button, .filtro,
.btn-primario, .btn-secundario, .btn-cotiza, .card-categoria {
  font-family: var(--font-titulo);
}

/* Barra superior */
.topbar {
  background: var(--color-oscuro);
  color: #ddd6d1;
  font-size: 0.8rem;
}

.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.4rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.topbar-inner a { text-decoration: none; }
.topbar-inner a:hover { color: white; }

.topbar-social {
  display: flex;
  gap: 1rem;
}

/* Header principal */
.site-header {
  background: white;
  border-bottom: 1px solid var(--color-borde);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--color-oscuro);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.logo-img {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-borde);
}

.logo span {
  font-weight: 400;
  color: var(--color-primario);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.main-nav a {
  text-decoration: none;
  color: var(--color-oscuro);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.main-nav a.activo {
  color: var(--color-primario);
}

.btn-cotiza {
  background: var(--color-primario);
  color: white !important;
  padding: 0.6rem 1.2rem;
  border-radius: 3px;
  font-weight: 600;
}

.btn-cotiza:hover {
  background: var(--color-primario-oscuro);
}

nav.tabs {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.5rem 0;
  max-width: 1200px;
  margin: 0 auto;
}

nav.tabs button {
  background: none;
  border: none;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  cursor: pointer;
  color: var(--color-acero);
  border-bottom: 3px solid transparent;
}

nav.tabs button.activo {
  border-bottom-color: var(--color-primario);
  color: var(--color-oscuro);
  font-weight: 600;
}

main {
  padding: 1rem 1.5rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 50vh;
}

#categoria-filtros {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.filtro {
  border: 1px solid var(--color-acero);
  background: white;
  padding: 0.4rem 0.9rem;
  border-radius: 3px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-oscuro);
}

.filtro.activo {
  background: var(--color-primario);
  color: white;
  border-color: var(--color-primario);
}

#grid, #servicios-lista {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.1rem;
}

.card, .servicio-card {
  background: white;
  border: 1px solid var(--color-borde);
  border-top: 3px solid var(--color-oscuro);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.15s, transform 0.15s, border-top-color 0.15s;
}

.card:hover {
  box-shadow: 0 8px 20px rgba(0,0,0,0.14);
  transform: translateY(-3px);
  border-top-color: var(--color-primario);
}

.card-img {
  aspect-ratio: 4 / 3;
  background: var(--color-fondo);
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  color: var(--color-acero);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  background-image: repeating-linear-gradient(-45deg, rgba(107,99,88,0.06) 0 10px, transparent 10px 20px);
}

.img-placeholder::before {
  content: "🧱";
  font-size: 1.4rem;
}

.card-body, .servicio-card {
  padding: 0.9rem;
}

.card-categoria {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--color-primario);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.card-body h3, .servicio-card h3 {
  font-size: 1rem;
  margin: 0.25rem 0;
}

.card-precio {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--color-primario);
  margin: 0.25rem 0;
}

.servicio-precio {
  font-weight: 800;
  color: var(--color-primario);
  margin: 0.25rem 0;
}

.card-stock {
  font-size: 0.8rem;
  color: #777;
  margin: 0;
}

.servicio-desc {
  font-size: 0.85rem;
  color: #555;
}

.cargando, .error, .vacio {
  grid-column: 1 / -1;
  text-align: center;
  color: #777;
  padding: 2rem 0;
}

.error { color: var(--color-primario); }

/* Botón flotante de WhatsApp */
.whatsapp-float {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  background: #25D366;
  color: white;
  text-decoration: none;
  padding: 0.75rem 1.1rem;
  border-radius: 999px;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
  z-index: 50;
}

/* Footer */
.site-footer {
  background: var(--color-oscuro);
  color: #ddd6d1;
  border-top: 4px solid var(--color-primario);
  padding: 2.5rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-col-marca {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-logo-img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--color-acero);
}

.footer-col h4 {
  color: white;
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-titulo);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.footer-col p {
  margin: 0.35rem 0;
  font-size: 0.9rem;
}

.footer-col a {
  text-decoration: none;
}

.footer-col a:hover {
  color: white;
}

/* Formulario de cotización */
.form-cotizador {
  max-width: 720px;
  margin: 0 auto;
  background: white;
  border: 1px solid var(--color-borde);
  border-top: 4px solid var(--color-primario);
  border-radius: 6px;
  box-shadow: 0 4px 18px rgba(28,25,23,0.06);
  padding: 2rem;
}

.form-paso { display: none; }
.form-paso.activo { display: block; }

.form-paso h2 {
  margin-top: 0;
  font-size: 1.3rem;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.progreso-wrap {
  margin: -0.25rem 0 1.5rem;
}

.progreso-barra {
  height: 6px;
  border-radius: 3px;
  background: var(--color-borde);
  overflow: hidden;
}

.progreso-fill {
  height: 100%;
  width: 0%;
  background: var(--color-primario);
  transition: width 0.25s ease;
}

.progreso-texto {
  text-align: center;
  color: var(--color-acero);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0.5rem 0 0;
}

.form-grupo {
  margin-bottom: 1.25rem;
}

.form-grupo label.titulo {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-grupo input[type="text"],
.form-grupo input[type="tel"],
.form-grupo input[type="email"],
.form-grupo input[type="number"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-borde);
  border-radius: 6px;
  font-size: 0.95rem;
}

.opciones-radio {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.6rem;
}

.opcion-card {
  border: 1px solid var(--color-borde);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: pointer;
  text-align: center;
  font-size: 0.9rem;
}

.opcion-card.seleccionada {
  border-color: var(--color-primario);
  background: #fbeee7;
  font-weight: 600;
}

.opcion-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.opcion-img.img-placeholder {
  font-size: 0.65rem;
}

.lote-fila {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 0.5rem;
  align-items: end;
  margin-bottom: 0.6rem;
}

.lote-fila label {
  font-size: 0.75rem;
  color: #666;
  display: block;
  margin-bottom: 0.2rem;
}

.btn-quitar-lote {
  background: none;
  border: 1px solid var(--color-borde);
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  cursor: pointer;
  color: var(--color-primario);
}

.btn-secundario, .btn-primario {
  border: none;
  border-radius: 3px;
  padding: 0.65rem 1.3rem;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.btn-secundario {
  background: var(--color-fondo);
  color: var(--color-oscuro);
  border: 1px solid var(--color-acero);
}

.btn-primario {
  background: var(--color-primario);
  color: white;
}

.btn-primario:hover { background: var(--color-primario-oscuro); }

.form-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 1.5rem;
}

.resumen-item {
  display: flex;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--color-borde);
  font-size: 0.9rem;
}

.confirmacion {
  text-align: center;
  padding: 2rem 0;
}

.estimado-box {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  background: var(--color-fondo);
  border: 1px solid var(--color-borde);
  border-left: 4px solid var(--color-primario);
  border-radius: 6px;
}

.estimado-label {
  font-family: var(--font-titulo);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.75rem;
  color: var(--color-acero);
}

.estimado-valor {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-primario);
  margin: 0.25rem 0 0.4rem;
}

.estimado-nota {
  font-size: 0.78rem;
  color: var(--color-acero);
  margin: 0;
}

.condiciones-pago {
  margin-top: 1rem;
  padding: 0.9rem 1.1rem;
  background: white;
  border: 1px solid var(--color-borde);
  border-radius: 6px;
}

.condiciones-pago ul {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
  font-size: 0.82rem;
  color: var(--color-oscuro);
}

.condiciones-pago li {
  margin-bottom: 0.3rem;
}

/* Página legal (política de privacidad, etc.) */
.legal-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.legal-contenido h1 {
  font-size: 1.9rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 0.3rem;
}

.legal-fecha {
  color: var(--color-acero);
  font-size: 0.85rem;
  margin-top: 0;
  margin-bottom: 1.8rem;
}

.legal-contenido h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
}

.legal-contenido p,
.legal-contenido li {
  line-height: 1.6;
  color: var(--color-oscuro);
}

.legal-contenido ul {
  padding-left: 1.3rem;
}

.legal-contenido li {
  margin-bottom: 0.4rem;
}

.legal-contacto {
  list-style: none;
  padding-left: 0;
  background: white;
  border: 1px solid var(--color-borde);
  border-left: 4px solid var(--color-primario);
  border-radius: 6px;
  padding: 1rem 1.2rem;
}

/* Menú desplegable "Guías Técnicas" (sin JS, con <details>) */
.nav-dropdown {
  position: relative;
}

.nav-dropdown summary {
  cursor: pointer;
  text-decoration: none;
  color: var(--color-oscuro);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  font-family: var(--font-titulo);
  list-style: none;
}

.nav-dropdown summary::-webkit-details-marker { display: none; }
.nav-dropdown summary::after { content: " \25BE"; font-size: 0.75em; }

.nav-dropdown[open] summary { color: var(--color-primario); }

.nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 0.8rem);
  left: 0;
  background: white;
  border: 1px solid var(--color-borde);
  border-top: 3px solid var(--color-primario);
  border-radius: 4px;
  min-width: 220px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  z-index: 20;
  padding: 0.4rem 0;
}

.nav-dropdown-panel a {
  display: block;
  padding: 0.6rem 1rem;
  text-decoration: none;
  color: var(--color-oscuro);
  font-family: var(--font-cuerpo);
  font-weight: 500;
  font-size: 0.9rem;
  text-transform: none;
  letter-spacing: normal;
}

.nav-dropdown-panel a:hover {
  background: var(--color-fondo);
  color: var(--color-primario);
}

/* Página de guía técnica: hero + tarjetas ilustradas */
.guia-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.guia-hero {
  padding: 2.5rem 0 1rem;
  text-align: center;
}

.guia-hero h1 {
  font-size: 2.1rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 0.4rem;
}

.guia-hero p {
  color: var(--color-acero);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

.guia-diagrama {
  display: block;
  margin: 1.5rem auto;
  max-width: 100%;
  height: auto;
}

.guia-seccion {
  margin: 3rem 0;
}

.guia-seccion h2 {
  font-family: var(--font-titulo);
  text-transform: uppercase;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  border-left: 5px solid var(--color-primario);
  padding-left: 0.8rem;
  margin-bottom: 1.4rem;
}

.tarjetas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.tarjeta {
  background: white;
  border: 1px solid var(--color-borde);
  border-top: 3px solid var(--color-primario);
  border-radius: 6px;
  padding: 1.2rem 1.1rem;
}

.tarjeta .tarjeta-icono {
  width: 44px;
  height: 44px;
  margin-bottom: 0.6rem;
}

.tarjeta h3 {
  font-family: var(--font-titulo);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0 0 0.4rem;
}

.tarjeta p {
  font-size: 0.88rem;
  line-height: 1.55;
  color: #555;
  margin: 0;
}

.datos-tecnicos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.dato-box {
  background: var(--color-oscuro);
  color: white;
  border-radius: 6px;
  padding: 1rem;
  text-align: center;
}

.dato-box .valor {
  font-family: var(--font-titulo);
  font-size: 1.3rem;
  color: var(--color-primario);
  display: block;
}

.dato-box .etiqueta {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #ddd6d1;
}

.pasos-flujo {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: stretch;
  margin: 1.5rem 0;
}

.paso-box {
  flex: 1 1 150px;
  background: var(--color-fondo);
  border: 1px solid var(--color-borde);
  border-radius: 6px;
  padding: 1rem;
  position: relative;
  text-align: center;
}

.paso-box .paso-num {
  display: inline-block;
  background: var(--color-primario);
  color: white;
  width: 26px;
  height: 26px;
  line-height: 26px;
  border-radius: 50%;
  font-family: var(--font-titulo);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.paso-box p {
  font-size: 0.82rem;
  margin: 0;
  color: #555;
}

.paso-flecha {
  display: flex;
  align-items: center;
  color: var(--color-primario);
  font-size: 1.3rem;
  font-weight: 700;
}

@media (max-width: 640px) {
  .paso-flecha { display: none; }
}